Machinist&#39;s jig.



PATENTED APR. '7, 1908.

I B. P. PORTIN. MACHINI STS JIG. ED JUNE 12 1905. BEN

FIG. 8;

-W1TNESS ES: 4

N0. 883,869. PATENTED APR. '7, 1908.

BQP; PORTIN. I

MAOHINISTS JIG.

APPLICATION TILED JUNE 12, 1905. BEIIEWED SEPT. 5. 190'].

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FIG. 2. w /0 FIG WITNESSES: I I [MAE/viola A214 Altar/m y N0. 883,869. PATENTED APR. 7, 1908. B. P. PORTIN.

MAGHINISTS JIG: APPLICATION FILED JUNE 12, 1905. RENEWED SEPT. 5. 1907.

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' INVEN'I' A A l Allorney MJMM No. 883,869. PATENTED APR. 7,1908.

B. P. m I MAGHINISTS JIG.

APPLIOLTION FILED JUNE 12, 1905. RENEWED SEPT. 6. 1907.

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Allan/0y UNITED STATES- PATENT OFFICE.

MACHINISTS JIG.

Specification of Letters Patent. I

Patented April 7, 1908.

Application filed June 12, 1905, Serial No. 264,800. Renewed September 5, 1907. Serial No. 391,610.

To all whom it may concern:

Be it known that I, BENJAMIN P. FORTIN, citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Machinists Jigs, of which the following is a specification.

This invention relates to jigs or holders in which castings and similar articles are held for boring, reaming, tapping, and like operation.

The object of the invention is to roduce a box jig capable of a wide range of use, so that irregular articles of many different shapes may be severally introduced into the jig, and when an article is so introduced it may be firmly held, and still be accessible for the various processes and tools which are subsequently applied to the article. The jiguis provided with projections on all sides, W 'ch act as legs to sup' ort the jig and inclosed article on the drill irregular piece clamped in the jig. Fig. 6 is a horizontal section, about centrally of the jig, showing clamping means for the piece shown in Fig. 5, and presenting another side of the work. Fig. 7 1s a vertical section involving the parts of Fig. 4.. 8 shows.

face and side views of flat spring.

The jig has a rigid skeleton frame 1, 1, which frame is provided with slots or openings 2, 2, etc., in the top, bottom, sides and ends, such openings being for the entrance of tools to o erate on an article within the jig, and for t e support of holding pieces be-. tween which the work is confined.

The clamping cover 3 of the skeleton frame is hinged thereto at 4, by a suitable hinge joint. Thelfront end of cover, 3 is forked, and a bolt 5, pivoted to the frame at 6, may be swung between or away from the arms of the fork. When swung into the fork, a nut 7 on the bolt may be screwed to position to hold the cover securely. The cover can be swung back for the insertion 'of any article into the skeleton frame, and can be closed and clamped securely by the means bed or other machine whichever side of the frame be upper-' I described. When closed the cover becomes practically as rigid as the other sides of the skeleton frame.

the skeleton frame, there is a bushing or bushings 10, (Fig. 7), with bodies narrow enough to pass through the slot 2, and heads 11 which cannot so pass through the slot. The edges of these heads rest on the material at the edges of'slot 2. The bushing is threaded at its other end, and a nut 12 can be applied to this threaded portion. Washers 14 frame and either outside or inside the frame. Bushing 10 may itself serve as a guide sleeve for a tool.

Inside the bushing 10 there may be drill or tap guides 15, in the form of sleeves, which neat y fit the bore of the bushings. These guides are preferably formed with heads 16, and may be readily removed from the position shown in Fig. 7, and placed in the position shown in Fig. 5, or otherwise. The work will then rest on the heads 16, and the guides may be held in place by nuts 17 engaging a thread on the outer end of the guide sleeves.

Guide sleeves 15 are prepared especially for the Work, in most cases. Consequently the thickness of the head of such guide sleeves may be more or less, and the bore through which the drill or reamer is passed is also made to conform to the Work in hand. It is desirable to have all the bushings, Washers, guide sleeves, spring pins and gage points interchangeable. (See head 160, and bore 161, Fig. 5, for example.)

Referring again to Fig. 7', it will be seen that clamping pins 20 pass through the slot 2 in the cover 3. .These pins 20 have their bodies screw threaded, and nuts 21 permit the .pins to be adjusted to any desirable height in the slot. Washers 23 form bearings for nuts 21. Thus if the body to be worked be regular, as at A, Fig. 7, or irregular, (as at B, Fig. 5), the bearing ins may be moved up or down, as well as si ewise in the slots, so as to get the best possible grip on the work in the jig, and a similar adjustment may be made for the supports under the work. Then, drills, reame'rs, taps, &c., may be assed to the work, either through the gui e sleeves, or through the slots between the sleeves and pins.

When the jig is adjusted for a casting or In the slot 2 in the side, top or bottom of 'can be interposed between the nut and other article of a given size and shape, such article can be removed and another of like form can beinserted with certainty thatthe work will be brought to the tool in-the same relation in each case, so that duplicates can be produced with exactness. T e end su port of the article clamped in the jig may e a piece especially ada ted to the work. See

for example screw co ar 31, Fig. 7, provided with an eccentric pin 100. This pin 100 slllipports the work, while a flat spring 99 gs. 4 and 7), bears against the other end thereof. Screw collar 31 may be a plied to bushing 10. Sprin 99 can be held y oneof the age screws. y having a number of bushings 10 with their adjuncts, all being interchangeable as to position but not uniform as to the matter of projection inside a slot 2, the jig is adapted to the holding of a large variety of articles.

Where the guiding sleeves are not secured to the bushings, they generally. fit closely enough to retain their positions. In some instances a bushing, as 40, Fig. 6,, is made with-an internal screw thread, into which a threaded sleeve 41' fits. This sleeve contains a spring 42, and a spring-pressed pin 43, ar-

ranged in a common manner to project the pig-against the work. A nut 44 serves to 't the-movement of such pin. The bushing 40',-\Fig. 6', is shown as a plied to one of the slots 2 in the side ofthe ig, but it might be applied in the same manner in other positions. Lock nuts 60 and 61 (Fig.5) may.

hold the sleeve41, if desirable. Bushings 45 are'internally screw threaded (see Fig. 6) and gage screws 47 are passed through these bushings. The gage screws can be locked by lock nuts '48. r g

It is to' be understood that in most instances a bushing and attachments may be transferredfrom one slot to another in the.

. frame 1. Also, as shown in Fig, 5, the bearracy, yet when desirab ing pin 45 may have an eccentric relation to the ushing. The slotted cover 3 may carry a yoke 55, which is also preferably slotted,

and contains bearing pins 56 and 57, differing in form somewhat from the bearing pins described, but 0 erating in like manner.

From the a ove it should be understood that my jig, b means of its adjustable bushings, pins, an guide sleeves, is adaptable for use with a large variety of work. That the bushin s may generally servealso as guides for dri reamers, or similar tools, and the work can be so adjusted that any number of fac similes may be o ierated on with accue to make changes the same can be madeEwithin the size limits .of

thejig, with great facility, as the-castings operated on, whether re lar or irregular m form, can be so clampe in the jig as to be accessiblein nearl all its parts likel to be operated on, wit out changin' the a justment. -With each jig I genera y supply a few extra bushings, guides, and washers, so

the center of the jig. 11. The combination of a box jig having tihsltg its capacity for adaptation covers a wide Where an eccentric bushing is used, as at- 45, Fig. 5,'it is obvious that such can be turned on its center to bring the passage through the bushing to various Without changing'the general ositlon of the bushing, and this whether t e bushing is used as atool guide, or as a support for a .clam ing pin, screw, or collar.

at I claim is:

1. In ajig, the combination of the slotted frame, a headed bushing having its head Within and its body assing through one of the slots and means or adjusting and holding said bushing, and a clamp screw engagmg V a thread in said bushing.

2. In a clamping jig, the'combination of ositions,

the slotted frame, a headed bushing in a slot in the frame, and a spring-pressed bearing pin projecting from the bushing.

3. In a jig, the combination of the slotted frame, bushings adjustable in the slots in the frame,- and a slotted hinged cover to the frame having an adjustab e bearing pin in the slot in said cover.

4. In a jig, the combination of a slotted frame, a slotted c'overhinged to said frame,

means for securing said cover when closed,

slotted frame, a bushmg having eccentric bore and having its body passing through a bushing in the slot.

' 8. In a jig, the combination of a frame having a slot therein, a bushing with eccenslot in the frame, and means for locking the -tric bore. having its body in said slot, and a clam piece in said eccentric bore.

n a jig, a frame having slots in a plu-.

rality of sides, tool guides in said slots and means for holding said guides. in adjusted osition, a clamping cover connected to said ame, and projections on the frame by which the jig is supported in substantially horizontal position on a horizontal support whichever slot be turned uppermost.

- 10. The combination of a box jig having sIotte d sides,bushings passing through theslots and having heads within the jig wder than the slots serving as rigid supports for work and means permitting adjustment of the'posltion of the eads toward and from the slotted sides, a hollow bushing passing I Within the jig wider than the slot serving as shapes and sizes of work consisting of one or bore serving as a guide for a tool to act upon through one of the slots and having a head a support for work, and means for adjusting the position of the head toward and from the center of, the jig to accommodate different more washers inserted between the head and the wall of the jig. v

12. In a box jig having slotted sides, means for holding and working upon objects of difierent sizes and shapes comprising bushings passing through slots in the sides of the jig and having interior heads wider than the slots serving as su ports for the work, one of said bushings a so having a central 1n presence of two witnesses.

the work, and other bushings passing,

through similar slots and adjustable longiy tudinally, and adjustable pins carried said bushings for engaging the work and holding it against the heads of the bushings first mentioned. I 4

13. In a jig, the combination of a hollow body, a bushing mounted in aslot therein, and a spring clip adapted to yieldingly engage an object to be worked on'mounted on the bushing and adjustable both radially and an larly in'relation to the bushing. ii testimony whereof I afiix my signature BENJAMIN P. FORTIN.

Witnesses:

CLARENCE H. COOHRAN, JOHN J MrNNroK. 

